package string;

public class StringBuilderDemo {
	public static void main(String[] args) {
		
		String str = "好好学习Java";
		StringBuilder builder = new StringBuilder(str);
		
		builder.append("，为了找个好工作");
		System.out.println(builder);
		
		builder.replace(9,16,"就是为了改变世界");
		System.out.println(builder);
		
		builder.delete(0,8);
		System.out.println(builder);
		
		builder.insert(0,"活着");
		System.out.println(builder);
		
		
		
		
		/*
		StringBuilder builder1 = new StringBuilder();
		StringBuilder builder2 = new StringBuilder("abc");
		
		String str = "abc";
		StringBuilder builder3 = new StringBuilder(str);
		String str2 = builder3.toString();
		
		 */
	}
}


